Flutter：页面中触发点击事件，通过id更新特定视图

当页面触发某些事件后，我不想整个视图都更新，而是通过id去更新特定的一块内容

controller

class StartController extends GetxController {
  StartController();
  String title = "";
  void onTap(int ticket) {
    title = "GetBuilder -> 点击了第 $ticket 个按钮";
    update(['splash_title']);
  }
}

view

import 'package:flutter/material.dart';
import 'package:get/get.dart';

import 'index.dart';

class StartPage extends GetView<StartController> {
  const StartPage({super.key});

  // 主视图
  Widget _buildView() {
    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        // 文字标题
        GetBuilder<StartController>(
          id: "splash_title",
          builder: (_) {
            return Center(
              child: Text(controller.title),
            );
          },
        ),

        // 按钮
        ElevatedButton(
          onPressed: () {
            controller.onTap(DateTime.now().microsecondsSinceEpoch);
          },
          child: const Text("立刻点击"),
        ),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return GetBuilder<StartController>(
      init: StartController(),
      id: "start",
      builder: (_) {
        return Scaffold(
          appBar: AppBar(title: const Text("start")),
          body: SafeArea(
            child: _buildView(),
          ),
        );
      },
    );
  }
}